diff --git a/plone/formwidget/captcha/browser/configure.zcml b/plone/formwidget/captcha/browser/configure.zcml
index 87d55c9..09222f3 100644
--- a/plone/formwidget/captcha/browser/configure.zcml
+++ b/plone/formwidget/captcha/browser/configure.zcml
@@ -2,18 +2,17 @@
     xmlns="http://namespaces.zope.org/zope"
     xmlns:browser="http://namespaces.zope.org/browser"
     i18n_domain="collective.captcha">
-    
+
   <browser:view
       name="captcha"
       for="*"
-      permission="zope2.Public"
+      permission="zope.Public"
       provides=".interfaces.ICaptchaView"
-      class=".captcha.Captcha"
-      >
-    
+      class=".captcha.Captcha">
+
     <browser:page name="image" attribute="image" />
     <browser:page name="audio" attribute="audio" />
-  
+
   </browser:view>
 
 </configure>
diff --git a/plone/formwidget/captcha/browser/interfaces.py b/plone/formwidget/captcha/browser/interfaces.py
index 371883e..3c733d3 100644
--- a/plone/formwidget/captcha/browser/interfaces.py
+++ b/plone/formwidget/captcha/browser/interfaces.py
@@ -1,38 +1,39 @@
 from zope.interface import Interface
 
+
 class ICaptchaView(Interface):
     """Captcha generating and verifying view
-        
-    Usage: 
-        
+
+    Usage:
+
         - Use the view from a page to generate an image tag and/or an audio
           URL. Use the 'image_tag' and 'audio_url' methods for these.
-        
+
         - Place the image tag and/or audio url in the page
-        
+
         - The image tag will load the captcha for the user, or the user will
           use the audio url to listen to the aural captcha.
-        
+
         - The user will identify the word, and tell the server through a form
           submission.
-        
+
         - Use the user input to verify.
-        
+
     The view will ensure that captcha state is preserved until verification
     has taken place. The image tag and audio url for a given instance of the
     captcha view will give the same word.
-        
+
     """
-    
-    def image_tag(self):
+
+    def image_tag():
         """Generate an image tag linking to a captcha"""
-    
-    def audio_url(self):
+
+    def audio_url():
         """A URL for an aural captcha"""
-    
-    def verify(self, input):
+
+    def verify(input):
         """Verify the user-supplied input.
-        
+
         Returns a boolean value indicating if the input matched
-        
+
         """